385629709 has 2 divisors, whose sum is σ = 385629710. Its totient is φ = 385629708.

The previous prime is 385629691. The next prime is 385629721. The reversal of 385629709 is 907926583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257442025 + 128187684 = 16045^2 + 11322^2 .

It is a cyclic number.

It is not a de Polignac number, because 385629709 - 2⁹ = 385629197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385629509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192814854 + 192814855.

It is an arithmetic number, because the mean of its divisors is an integer number (192814855).

Almost surely, 2^385629709 is an apocalyptic number.

It is an amenable number.

385629709 is a deficient number, since it is larger than the sum of its proper divisors (1).

385629709 is an equidigital number, since it uses as much as digits as its factorization.

385629709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 385629709 is about 19637.4567854394. The cubic root of 385629709 is about 727.8750420767.

The spelling of 385629709 in words is "three hundred eighty-five million, six hundred twenty-nine thousand, seven hundred nine".